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(convert_memory_address, case PLUS, MULT): Don't commute operation

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with extension if not adding small integer.

From-SVN: r12292
This commit is contained in:
Richard Kenner 1996-06-18 06:33:10 -04:00
parent 489af5d14b
commit 0b04ec8c21
1 changed files with 17 additions and 10 deletions
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27
gcc/explow.c
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@ -304,8 +304,11 @@ convert_memory_address (to_mode, x)
enum machine_mode to_mode;
rtx x;
{
enum machine_mode from_mode = to_mode == ptr_mode ? Pmode : ptr_mode;
rtx temp;
/* Here we handle some special cases. If none of them apply, fall through
to the default case. */
switch (GET_CODE (x))
{
case CONST_INT:
@ -320,21 +323,25 @@ convert_memory_address (to_mode, x)
SYMBOL_REF_FLAG (temp) = SYMBOL_REF_FLAG (x);
return temp;
case PLUS:
case MULT:
return gen_rtx (GET_CODE (x), to_mode,
convert_memory_address (to_mode, XEXP (x, 0)),
convert_memory_address (to_mode, XEXP (x, 1)));
case CONST:
return gen_rtx (CONST, to_mode,
convert_memory_address (to_mode, XEXP (x, 0)));
default:
return convert_modes (to_mode,
to_mode == ptr_mode ? Pmode : ptr_mode,
x, POINTERS_EXTEND_UNSIGNED);
case PLUS:
case MULT:
/* For addition the second operand is a small constant, we can safely
permute the converstion and addition operation. We can always safely
permute them if we are making the address narrower. */
if (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (from_mode)
|| (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 1)) == CONST_INT
&& INTVAL (x) + 20000 < 40000))
return gen_rtx (GET_CODE (x), to_mode,
convert_memory_address (to_mode, XEXP (x, 0)),
convert_memory_address (to_mode, XEXP (x, 1)));
}
return convert_modes (to_mode, from_mode,
x, POINTERS_EXTEND_UNSIGNED);
}
#endif